🌏What are the 7 steps in wastewater treatment?1️⃣PumpingThe wastewater system relies on the force of gravity to move sewage from your hom...

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🌏What are the 7 steps in wastewater treatment?1️⃣PumpingThe wastewater system relies on the force of gravity to move sewage from your hom...
🌏What are the 7 steps in wastewater treatment?

1️⃣Pumping
The wastewater system relies on the force of gravity to move sewage from your home to the treatment plant. So wastewater-treatment plants are located on low ground, often near a river into which treated water can be released. If the plant is built above the ground level, the wastewater has to be pumped up to the facility.

2️⃣Screening
Wastewater entering the treatment plant includes items like wood, rocks, etc. Unless they are removed, they could cause problems later in the treatment process.

3️⃣Removing grit and sludge
Wastewater then enters the second section of sedimentation tanks. Here, the sludge (the organic portion of the sewage) settles out of the wastewater and is pumped out of the tanks.

4️⃣Sedimentation – removing scum
As sludge is settling to the bottom of the sedimentation tanks, lighter materials are floating to the surface. This ‘scum’ includes grease, oils, plastics, and soap. Slow-moving rakes skim the scum off the surface of the wastewater. Scum is thickened and pumped to the digesters along with the sludge.

5️⃣Aerating and Biological Reduction
One of the steps that a water treatment facility can do is to just shake up the sewage and expose it to air. This causes some of the dissolved gases (such as hydrogen sulfide, which smells like rotten eggs) that taste and smells bad to be released from the water. Wastewater enters a series of long, parallel concrete tanks. Each tank is divided into two sections. In the first section, air is pumped through the water.
Bubbling oxygen through the water also keeps the organic material suspended while it forces grit to settle out.

6️⃣Final sedimentation
Sedimentation is a physical water treatment process using gravity to remove suspended solids from water. For sedimentation to take place, the solids being deposited must be denser than the medium in which they reside.

7️⃣Disinfection–Killing bacteria
Finally, the wastewater flows into a ‘chlorine contact’ tank, where the chemical chlorine is added to kill bacteria. The chlorine is mostly eliminated as the bacteria are destroyed, but sometimes it must be neutralized by adding other chemicals.

✅The treated water (called effluent) is then discharged to a local river or the ocean.

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